From patchwork Fri Oct 25 09:50:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Carlo Nonato X-Patchwork-Id: 13850376 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BF0B6D0C5F9 for ; Fri, 25 Oct 2024 09:51:20 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.825708.1240030 (Exim 4.92) (envelope-from ) id 1t4Gy5-0006ah-Vu; Fri, 25 Oct 2024 09:50:53 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 825708.1240030; Fri, 25 Oct 2024 09:50:53 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1t4Gy5-0006aU-Sb; Fri, 25 Oct 2024 09:50:53 +0000 Received: by outflank-mailman (input) for mailman id 825708; Fri, 25 Oct 2024 09:50:53 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1t4Gy5-0006YL-1m for xen-devel@lists.xenproject.org; Fri, 25 Oct 2024 09:50:53 +0000 Received: from mail-ed1-x52c.google.com (mail-ed1-x52c.google.com [2a00:1450:4864:20::52c]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 9e28dcd7-92b6-11ef-99a3-01e77a169b0f; Fri, 25 Oct 2024 11:50:50 +0200 (CEST) Received: by mail-ed1-x52c.google.com with SMTP id 4fb4d7f45d1cf-5c9428152c0so2082726a12.1 for ; Fri, 25 Oct 2024 02:50:50 -0700 (PDT) Received: from carlo-ubuntu.home (dynamic-adsl-94-34-131-227.clienti.tiscali.it. [94.34.131.227]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5cbb629e17dsm446938a12.34.2024.10.25.02.50.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Oct 2024 02:50:49 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 9e28dcd7-92b6-11ef-99a3-01e77a169b0f DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=minervasys-tech.20230601.gappssmtp.com; s=20230601; t=1729849850; x=1730454650; darn=lists.xenproject.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=UyA/ZuJvaOJFoZeIKYOus0QAol5WmNmc0X1awq7lIS8=; b=f3hwz61GNXHYpeBNM+XVqhxu3eLF7yWD2ohyiYic4dPjpPx0+TCvI70G4ua++g4Rbu bn9UL6AUWps1Sw65GIhK33hRyBaZ3FA+GbDYdFtufKGlJZhvxgoHh7OfuYAUfvNaRNu2 uMMZgD2NbtmWsgG9/wGlwj6YrdmU1u6StRYJm9S/l0UogDTvMRpM1feSurIwLEATM2y4 OE1042E+Uo8SYCbJSRuZzZVVO5Jhl1dLNWEJdahlY40sOWiXrcvGi9EsVaiAAB9Zl42Q 2ZH9SLNKJq45sWx6ibfmql2Lk3ft0UqpTwXudePRY32vjWNUY8Cl32oAfukwrr3uZ0rv E9hQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729849850; x=1730454650; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=UyA/ZuJvaOJFoZeIKYOus0QAol5WmNmc0X1awq7lIS8=; b=xCfHz4jKY4f9dOYrU6jyX/+eWYVVbuOwMPtNU5JQgH3qG8fecdKQgK3/JNg6LrSDAq ZRs3oZxFABZI38TrPkuTfT9Lm3fjCVbamwXdDA1m/foNmM6SAVz1sI9GcTlxH9CK2sLD R6z/QFDkqRPNFZzU7ugDFcbCyQuxXWgRJTmjgHtOftfvHAvUdd4IvzuB60wy9w/xqnKO rfAxblYLTbzVm4pPPUAvHQl1AF8j9NmIOmRGtLBa2Hylf+Aks3yoK8wryZPGNV9VtFGa awIJ5nLTdht6ZBccwJgyiKQXxOtmX3zN/EU95XiSEFOL0ClaPUllH5RtdgFDDpcsSGTW iNKg== X-Gm-Message-State: AOJu0YyJxbyiBvSA3rFtj/7vNn7hJaYKPEg7RcmOLUAgRwTO8qPkIhs3 MyFGJzBivxgOOVx3j47ebqijec3HagrwfGFZRZgRMl2bIwlQHrqyi4XkhcB7sEidvSTathinRAt bPPk= X-Google-Smtp-Source: AGHT+IGqR3a3QXX9MTAk32ZydfxkeSnAtCXUGA/TocU89J5ZaHCCHnlCtR24uCc6UNfO9nMObutc3w== X-Received: by 2002:a05:6402:2792:b0:5c9:893e:30d2 with SMTP id 4fb4d7f45d1cf-5cba244dce8mr3671251a12.8.1729849849887; Fri, 25 Oct 2024 02:50:49 -0700 (PDT) From: Carlo Nonato To: xen-devel@lists.xenproject.org Cc: andrea.bastoni@minervasys.tech, Carlo Nonato , Andrew Cooper , Jan Beulich , Julien Grall , Stefano Stabellini , Bertrand Marquis , Michal Orzel , Volodymyr Babchuk , Marco Solieri Subject: [PATCH v9 04/13] xen/arm: add Dom0 cache coloring support Date: Fri, 25 Oct 2024 11:50:05 +0200 Message-ID: <20241025095014.42376-5-carlo.nonato@minervasys.tech> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241025095014.42376-1-carlo.nonato@minervasys.tech> References: <20241025095014.42376-1-carlo.nonato@minervasys.tech> MIME-Version: 1.0 Add a command line parameter to allow the user to set the coloring configuration for Dom0. A common configuration syntax for cache colors is introduced and documented. Take the opportunity to also add: - default configuration notion. - function to check well-formed configurations. Direct mapping Dom0 isn't possible when coloring is enabled, so CDF_directmap flag is removed when creating it. Based on original work from: Luca Miccio Signed-off-by: Carlo Nonato Signed-off-by: Marco Solieri Reviewed-by: Jan Beulich --- v9: - moved domain_llc_coloring_free() in next patch cause it's never used for dom0 v8: - added bound check on dom0_num_colors - default colors array set just once v7: - parse_color_config() doesn't accept leading/trailing commas anymore - removed alloc_colors() helper v6: - moved domain_llc_coloring_free() in this patch - removed domain_alloc_colors() in favor of a more explicit allocation - parse_color_config() now accepts the size of the array to be filled - allocate_memory() moved in another patch v5: - Carlo Nonato as the new author - moved dom0 colors parsing (parse_colors()) in this patch - added dom0_set_llc_colors() to set dom0 colors after creation - moved color allocation and checking in this patch - error handling when allocating color arrays - FIXME: copy pasted allocate_memory() cause it got moved v4: - dom0 colors are dynamically allocated as for any other domain (colors are duplicated in dom0_colors and in the new array, but logic is simpler) --- docs/misc/cache-coloring.rst | 29 ++++++++ docs/misc/xen-command-line.pandoc | 9 +++ xen/arch/arm/domain_build.c | 10 ++- xen/common/llc-coloring.c | 119 +++++++++++++++++++++++++++++- xen/include/xen/llc-coloring.h | 1 + 5 files changed, 166 insertions(+), 2 deletions(-) diff --git a/docs/misc/cache-coloring.rst b/docs/misc/cache-coloring.rst index b608284e9b..c5fb33996c 100644 --- a/docs/misc/cache-coloring.rst +++ b/docs/misc/cache-coloring.rst @@ -105,6 +105,35 @@ Specific documentation is available at `docs/misc/xen-command-line.pandoc`. +----------------------+-------------------------------+ | ``llc-nr-ways`` | Set the LLC number of ways | +----------------------+-------------------------------+ +| ``dom0-llc-colors`` | Dom0 color configuration | ++----------------------+-------------------------------+ + +Colors selection format +*********************** + +Regardless of the memory pool that has to be colored (Xen, Dom0/DomUs), +the color selection can be expressed using the same syntax. In particular a +comma-separated list of colors or ranges of colors is used. +Ranges are hyphen-separated intervals (such as `0-4`) and are inclusive on both +sides. + +Note that: + +- no spaces are allowed between values. +- no overlapping ranges or duplicated colors are allowed. +- values must be written in ascending order. + +Examples: + ++-------------------+-----------------------------+ +| **Configuration** | **Actual selection** | ++-------------------+-----------------------------+ +| 1-2,5-8 | [1, 2, 5, 6, 7, 8] | ++-------------------+-----------------------------+ +| 4-8,10,11,12 | [4, 5, 6, 7, 8, 10, 11, 12] | ++-------------------+-----------------------------+ +| 0 | [0] | ++-------------------+-----------------------------+ Auto-probing of LLC specs ######################### diff --git a/docs/misc/xen-command-line.pandoc b/docs/misc/xen-command-line.pandoc index fbd8302db8..18973df075 100644 --- a/docs/misc/xen-command-line.pandoc +++ b/docs/misc/xen-command-line.pandoc @@ -963,6 +963,15 @@ Controls for the dom0 IOMMU setup. Specify a list of IO ports to be excluded from dom0 access. +### dom0-llc-colors (arm64) +> `= List of [ | - ]` + +> Default: `All available LLC colors` + +Specify dom0 LLC color configuration. This option is available only when +`CONFIG_LLC_COLORING` is enabled. If the parameter is not set, all available +colors are used. + ### dom0_max_vcpus Either: diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index 71bdc2b89c..d9500e47d4 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -2,6 +2,7 @@ #include #include #include +#include #include #include #include @@ -2286,6 +2287,7 @@ void __init create_dom0(void) .max_maptrack_frames = -1, .grant_opts = XEN_DOMCTL_GRANT_version(opt_gnttab_max_version), }; + unsigned int flags = CDF_privileged; int rc; /* The vGIC for DOM0 is exactly emulating the hardware GIC */ @@ -2313,10 +2315,16 @@ void __init create_dom0(void) panic("SVE vector length error\n"); } - dom0 = domain_create(0, &dom0_cfg, CDF_privileged | CDF_directmap); + if ( !llc_coloring_enabled ) + flags |= CDF_directmap; + + dom0 = domain_create(0, &dom0_cfg, flags); if ( IS_ERR(dom0) ) panic("Error creating domain 0 (rc = %ld)\n", PTR_ERR(dom0)); + if ( llc_coloring_enabled && (rc = dom0_set_llc_colors(dom0)) ) + panic("Error initializing LLC coloring for domain 0 (rc = %d)", rc); + if ( alloc_dom0_vcpu0(dom0) == NULL ) panic("Error creating domain 0 vcpu0\n"); diff --git a/xen/common/llc-coloring.c b/xen/common/llc-coloring.c index 3c98c86a56..35c6c36280 100644 --- a/xen/common/llc-coloring.c +++ b/xen/common/llc-coloring.c @@ -19,6 +19,66 @@ static unsigned int __initdata llc_nr_ways; integer_param("llc-nr-ways", llc_nr_ways); /* Number of colors available in the LLC */ static unsigned int __ro_after_init max_nr_colors; +/* Default coloring configuration */ +static unsigned int __ro_after_init default_colors[NR_LLC_COLORS]; + +static unsigned int __initdata dom0_colors[NR_LLC_COLORS]; +static unsigned int __initdata dom0_num_colors; + +/* + * Parse the coloring configuration given in the buf string, following the + * syntax below. + * + * COLOR_CONFIGURATION ::= COLOR | RANGE,...,COLOR | RANGE + * RANGE ::= COLOR-COLOR + * + * Example: "0,2-6,15-16" represents the set of colors: 0,2,3,4,5,6,15,16. + */ +static int __init parse_color_config(const char *buf, unsigned int *colors, + unsigned int max_num_colors, + unsigned int *num_colors) +{ + const char *s = buf; + + *num_colors = 0; + + while ( *s != '\0' ) + { + unsigned int color, start, end; + + start = simple_strtoul(s, &s, 0); + + if ( *s == '-' ) /* Range */ + { + s++; + end = simple_strtoul(s, &s, 0); + } + else /* Single value */ + end = start; + + if ( start > end || (end - start) > (UINT_MAX - *num_colors) || + (*num_colors + (end - start)) >= max_num_colors ) + return -EINVAL; + + /* Colors are range checked in check_colors() */ + for ( color = start; color <= end; color++ ) + colors[(*num_colors)++] = color; + + if ( *s == ',' ) + s++; + else if ( *s != '\0' ) + break; + } + + return *s ? -EINVAL : 0; +} + +static int __init parse_dom0_colors(const char *s) +{ + return parse_color_config(s, dom0_colors, ARRAY_SIZE(dom0_colors), + &dom0_num_colors); +} +custom_param("dom0-llc-colors", parse_dom0_colors); static void print_colors(const unsigned int *colors, unsigned int num_colors) { @@ -43,9 +103,26 @@ static void print_colors(const unsigned int *colors, unsigned int num_colors) printk(" }\n"); } +static bool __init check_colors(const unsigned int *colors, + unsigned int num_colors) +{ + unsigned int i; + + for ( i = 0; i < num_colors; i++ ) + { + if ( colors[i] >= max_nr_colors ) + { + printk(XENLOG_ERR "LLC color %u >= %u\n", colors[i], max_nr_colors); + return false; + } + } + + return true; +} + void __init llc_coloring_init(void) { - unsigned int way_size; + unsigned int way_size, i; if ( llc_size && llc_nr_ways ) { @@ -79,6 +156,9 @@ void __init llc_coloring_init(void) } else if ( max_nr_colors < 2 ) panic("Number of LLC colors %u < 2\n", max_nr_colors); + for ( i = 0; i < max_nr_colors; i++ ) + default_colors[i] = i; + arch_llc_coloring_init(); } @@ -100,6 +180,43 @@ void domain_dump_llc_colors(const struct domain *d) print_colors(d->llc_colors, d->num_llc_colors); } +static void __init domain_set_default_colors(struct domain *d) +{ + printk(XENLOG_WARNING + "LLC color config not found for %pd, using all colors\n", d); + + d->llc_colors = default_colors; + d->num_llc_colors = max_nr_colors; +} + +int __init dom0_set_llc_colors(struct domain *d) +{ + typeof(*dom0_colors) *colors; + + if ( !dom0_num_colors ) + { + domain_set_default_colors(d); + return 0; + } + + if ( dom0_num_colors > max_nr_colors || + !check_colors(dom0_colors, dom0_num_colors) ) + { + printk(XENLOG_ERR "%pd: bad LLC color config\n", d); + return -EINVAL; + } + + colors = xmalloc_array(typeof(*dom0_colors), dom0_num_colors); + if ( !colors ) + return -ENOMEM; + + memcpy(colors, dom0_colors, sizeof(*colors) * dom0_num_colors); + d->llc_colors = colors; + d->num_llc_colors = dom0_num_colors; + + return 0; +} + /* * Local variables: * mode: C diff --git a/xen/include/xen/llc-coloring.h b/xen/include/xen/llc-coloring.h index 67b27c995b..baf6d4add1 100644 --- a/xen/include/xen/llc-coloring.h +++ b/xen/include/xen/llc-coloring.h @@ -26,6 +26,7 @@ static inline void domain_dump_llc_colors(const struct domain *d) {} unsigned int get_llc_way_size(void); void arch_llc_coloring_init(void); +int dom0_set_llc_colors(struct domain *d); #endif /* __COLORING_H__ */